Color photography.



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To all whom it may concern:

lBe it known that I, ALEXANDER N. Pink- MAN, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented cer- Y slon of a novel film for use in color photography wherein the usual transparent base may be dispensed with, and a process for making the same.

Other objects of my invention will be pointed out in this specification and subsequently claimed.

The color screen of which I will make use in forming my improved plate or film is preferably made in the following manner: Having first provided aquantity of material which may be woven and which can be obtained in very fine strands, as for example, spun glass or silk, I divide this material into three lots separately colored blue, red and green respectively. If spun glass be used it can be spun from the colored glass and no subsequent coloring is necessary, but

a silk or like materials'must be dyed with the various colors. It .is to be understood, of course, that the precise shades of these colors may be varied somewhat, so that the fabric ultimately will appear as near white as possible. I then preferably weave these strands into a sheet, arranging the difi'er- 'ently colored strands in rotation, first a blue, then a green, and thena red, and so on, making use of. a weft of a fibrous or similar material which is substantially white or colorless. en spun glass is used for the colored elements, weft strands of silk are used as isthe ordinary practice in weaving fabrics from this material. The sepa rately colored strands are placed substan specification of Letters Patent.

Application filed April t, 1908. Serial No. 425,854.

Patented Aug. 2%, Ififfi.

tially in contact with one another, so that all hght which passes through the fabric must traverse some one of these strands and cannot pass between them. I may, of course vary the precise arrangement in weaving from that above described, but Whatever arrangement may be chosen it is obvious that such arrangement will be entirely under the control of the weaver. While I regard weaving as the preferable mode for making the screen, I do not wish to be limited to a woven screen as it may be formed in any way in which the relation of its colored elements may be subjectto entire control.-

In the drawings annexed to this speci-- fication and forming a part hereof, the same reference numerals being uniformly used therein to designate the same parts,.Figure 1 is a plan view of a color screen, the weft threads being omitted for clearness of illustration; Fig. 2 is a cross-sectional view of a film or plate wherein the color screen is used in connection with a transparent foundation; Fig. 3 is a view similar to Fig. 2 of a film wherein the color screen is embedded in a ribbon, the transparent foundation of the form of film shown in Fig. 2 being omitted, and Fig. 4 is a 'fragmental detail plan view of the screen on an enormously magnified scale.

The screen 1 is shown diagrammatically in Fig. 1 as being made up of the variously colored strands 2, 3 and 4 arranged in rotation parallel to one another, the weft omitted in this view but beingshown'at 7 in Fig. 4.

' Having formed the color screen as above described, I make use of the same in either of the following ways: I may take a suitable transparent foundation 5, such, for example, as a glass late or a celluloid film, and secure the co or sereen 1 thereto by means of a suitable transparent cement or varnish 8. In applying this screen to the foundation in th1s way, suitable means may be employed for pressin the foundation and screen together, as or example, they may be passed between pressure rollers, or other means for obtaining an intimate contact may be made use of, as will be understood. The transparent foundation withthe screen secured thereto is now thoroughly dried and a coating of sensitized material 6, "such for example, as silver bromid emulsion is applied thereto upon the screen in the way inwh ch ordinary photographic plates or films-are sensitized. The plate or film thus made,"

when dried, is *r'eady for use and a color photograph may be formed thereon by'ex posing it in a camera with the transparent foundation placed on the side toward-the lens, the light passing first through thisfoundation and then traversing the 'color screen and finally reaching the sensitized film or plate. After exposing, the plate or, film is developed in the usual way. in the dark, or-in a very dull red lightfat asafe distance, the image appearing as a negative, after which the image, WhlCh, when silver bromid is used as the sensitizing agent, is composed of reduced silver, is dissolved out with the proper chemicals, as is well known in the art, leaving the balance of the coating of unexposed silver bromid intact; Theplate is then washed andimmersed in a second developer and taken from'the dark room out into strong daylight toexpose the remaining silver bromid, and

this second development is completed in the light. After the plate or filmis washed and dried, the picture is complete and may be, viewed by transmitted light, the same colors in the picture as in the-object"; photographed. g Y

appearing An alternative wayfiii make use ofmy improved color screen for making color photo'gra hs consists in embeddingthe' screen in a flexible ribbon preferably by sat mating the fabric which makes up the screenwith a collodion or celluloid solution and then thoroughly drying the same. 'By this means I am enabled to. dispense with any transparent foundation such as shown at 5 in Fig. 2 and to provide a substantially integral foundation and'colorscreemthe integral foundation comprising a flexible'rib bon, the material of which covers all the strands ofthe color screen, fills all interstices between the strands and is substan makes it possible to secure substantially a 5 claim contact print, and because of the variously colored elements of the color screen being entirely under control 'in their arrangement on the screen, making it possible to so fposis tion the film which is being printed om, relative .to the film being printed, that the variously colored-elements in one may be made to register accurately with the" similarly colored elements in the other. 'By this means I am enabledto make from'one exposure'an indefinite number of color photographs. e

Having now described my invention, I

1.' A film for use in color photography, comprising a flexibleself-held-together color lucent ribbon in which said screenis embedded, the material of the ribbon being disposed substantially symmetrically on both sides of the screen, and having a coating of sensitized material applied thereto, substantially' as described.

,2. A film for use in color photography, comprising a flexible self-heldtogether color screen and a ribbon formed from a collodion solution and in which the said screen is embedded and substantially symmetrically disposed on both sides thereof, and having a coating of sensitized material applied thereto, substantially as described.

3. The process of making a film for use in color photography, which consists in forming a self-held-together color screen fwitli, the colors arranged in a definite and regular order, in saturatin the screen with -a suitable solution and disposing the material'of the solution substantially symmetricall' on both sides of the screen, in dry- 3 ing t e screen so treated, and in applying thereto a layer of sensitized material,.substantially as set forth.

4. The process of making a film for use in color photography, which consists in forming a flexible color screen by weaving .diflerently colored flexible strands with the colors arranged in a definite and regular order, in saturating the screen with a suitable solution and disposing the material of the solution substantially symmetrically on both sides of the screen, in drying the screen so treated, and in applying thereto a layer of sensitized material, substantially as set forth. 5. A film for use in color photography,

comprising a self-held-together color screen '80 screen and a flex ble, transparent'or transconsisting only of woven strands, a flexible transparent or translucent ribbon in which said screen is embedded, the material of the ribbon being disposed substantially symmetrically on both sides of the screen, and acoatlng of sensitized material 'u on said screen and ribbon, substantially as escribed. 6. A film for use in color photography,

weenie comprising e flexible transparent or trenson both sides of the screen, Substantially es lueent ribbon, a flexible color screen eondescribed. 1o sisting only of woven strands embedded in This specification signed and witnessed said ribbon, and a sensitized emulsion epthis 24th day of March 1908.

5 plied to the ribbon, the said ribbon and ALEXANDER N. PIERMAN.

screen forming the sole support for the iivitnessesz emulsion, and the material of said ribbon FRANK D. LEWIS,

being disposed substantially symmetrically H. H. Damn. 

